Colorimetric devices

The underlying principle is that the change in pH produced by different CO2 concentrations in solution will change the colour of an indicator. These are small devices that fit onto an endotracheal tube or the ventilator circuit and respond rapidly (up to 60 breaths/min). They can be affected by excessive humidity and generally only work in the range 0-4% CO2. They are useful to confirm tracheal intubation, during patient transfer and in the cardiac arrest situation.

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